<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>JS Bin</title>
</head>

<body>
    <div class="rainbow">
        <div>
            <div>
                <div>
                    <div>
                        <div>
                            <div>
                                <div>
                                    <div></div>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</body>

</html>